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A086207
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Sum of rank(M) over all n X n matrices over GF(4).
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1
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3, 435, 704403, 15823018515, 5272966965638163, 26837910294320000900115, 2117959516569888987677094001683, 2614420107255201240346554326291784252435, 50761384915342243255034590495173254359633089772563, 15560120110421752320376568335982564883819269596340271934585875
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OFFSET
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1,1
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LINKS
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FORMULA
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a(n) = Sum_{r=1..n} r*Product_{j=0..r-1} (q^n-q^j)^2/(q^r-q^j) with q=4.
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PROG
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(PARI) a(n) = {my(q=4); sum(r=1, n, r*prod(j=0, r-1, (q^n-q^j)^2/(q^r-q^j)))}
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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Yuval Dekel (dekelyuval(AT)hotmail.com), Aug 27 2003
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EXTENSIONS
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STATUS
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approved
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